ADLINK ACL-8454/12 - Manual (Page 25)

Installation & Configurations • 17
The two internal clock sources, CLOCK1 and CLOCK2 come from the
clock system (see 'Clock System section').
The cascaded clock source
comes from the output of the counter with smaller channel number. For
example, the COUT1 is cascaded to source of CLK2; the COUT3 is
cascaded to source of CLK4. The exceptions are the cascaded source of
CLK1 comes from COUT4 and the cascaded source of CLK7 comes from
COUT10.
The external clock source named as ECLK n comes from the 37-pins
connector. Figure 2.13 demonstrates the clock source jumper setting
counter channel 1 (CLK1) by jumper ‘ CK1 ’. In this figure, the clock source
comes from the internal source CLOCK1.
CLOCK1
CLOCK2
EXTERNAL (ECLK 1)
LAST CHANNEL (COUT4)
Sources of CLK1 (by setting jumper CK1)
CK1
I
IV III
II
I:
II:
III:
IV:
Figure 2.13 Setting the Clock Source of Counter #1
The jumper setting is flexible for user applications. There are four kinds of
configurations for every clock source jumper.
(1) Use internal clock source CLOCK1.
CLOCK1
CLOCK2
EXTERNAL
LAST CHANNEL
CLK n
CK n
I
IV III
II
I:
II:
III:
IV:
(2) Use internal clock source CLOCK2.
CLOCK1
CLOCK2
EXTERNAL
LAST CHANNEL
CLK n
CK n
I
IV III
II
I:
II:
III:
IV: